Sika Sika Greenstreak 609 PVC Retrofit System

What kind of joints is the Sika Greenstreak 609 system designed for? The 609 PVC Retrofit Waterstop System is specifically engineered for construction joints where new concrete meets existing concrete structures. Using a combination of mechanical anchoring with stainless steel batten bars and high-strength structural epoxy bonding, it creates a continuous, watertight seal across the joint interface. This makes it an ideal retrofit waterproofing solution for projects where traditional embedded waterstops are no longer an option.

Can the 609 waterstop handle joint movement? Yes. The 609 system is designed to accommodate limited joint movement, making it suitable for both vertical and horizontal retrofit joint applications. The flexible PVC profile works in tandem with the anchoring system to maintain a watertight seal even as the structure experiences minor shifts, thermal expansion, or settlement over time.

Is factory welding required for installation? Factory-fabricated fittings and intersections are strongly recommended for the 609 system and PVC waterstop installations in general. Pre-fabricated components reduce the risk of field weld errors that can compromise waterproofing integrity. When field welding is necessary, heat welding is the only approved installation method for PVC waterstop systems. Proper technique and the correct splicing equipment are essential for achieving a reliable, watertight connection.

Where is the 609 PVC Retrofit Waterstop System typically used? The 609 system is widely specified across a broad range of infrastructure and construction applications. Common uses include wastewater treatment plants, potable water containment structures, below-grade concrete restoration projects, tunnels, underground foundations, and industrial containment basins. Anywhere long-term leak prevention and structural waterproofing are critical, the 609 is a proven and trusted solution.

What epoxy is recommended for the 609 system? Sika recommends the use of a compatible two-component structural epoxy gel — such as Sika 7300 — for anchoring the retrofit waterstop to the existing concrete surface. The epoxy plays a critical role in achieving a full, watertight bond between the batten bar system and the concrete, and using the correct product is essential for long-term performance.

Is the 609 system NSF-61 certified? Yes. The Sika Greenstreak 609 PVC Retrofit Waterstop System is NSF-61 certified, meaning it meets the strict health and safety standards required for use in potable water structures. This certification makes it a code-compliant choice for water treatment facilities, drinking water reservoirs, and other applications involving contact with water intended for human consumption.

How does the 609 system compare to a standard embedded waterstop? Unlike traditional PVC waterstops that must be embedded in concrete during the original pour, the 609 retrofit system is designed to be installed on the face of existing concrete — making it the right solution when the original construction joint lacks an embedded waterstop or when an existing waterstop has failed. It delivers comparable waterproofing performance through its mechanical anchoring and epoxy bonding system, without requiring demolition or full joint reconstruction.